* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
  background-image: url('../images/bg.jpg');
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-position: center center;
  /* 背景覆盖整个viewport */
  background-size: cover;
  /* 当背景没有加载时的颜色 */
  background-color: #fff;
  font: 14px 'microsoft yehei';
  font-weight: 300;
}

a {
  color: #000;
  text-decoration: none;
}
button {
  display: inline-block;
  background-color: #fff;
  height: 30px;
  padding: 0 10px;
  font-size: 16px;
  border: 1px solid #dcdfe6;
  border-radius: 5px;
  outline: none;
  cursor: pointer;
}